开江—梁平海槽东侧飞仙关组岩相分区及地质意义

doi:10.11764/j.issn.1672-1926.2018.06.008

Abstract

Abstract: The evolution of sedimentary facies has always been an important factor restricting the development and distribution of Permian-Triassic reef-shoal reservoirs around Kaijiang-Liangping Trough.Based on drilling and core data，it is demonstrated that the Lower Triassic Feixianguan Formation in the eastern side of the Trough is divided into two parts by Luojiazhai-Zhengba-Zhaojiawan.Lithofacies zoning is obvious in both northern and southern parts.The seismic amplitude attribute indicates that the line is a high and low transition zone of sedimentary geomorphology which is characterized by the high energy deposition combination of residual oolitic dolomite and bright crystal oolitic limestone.The north of the line is an evaporation lithofacies combination consisting of gypsum,gypsum-bearing dolomicrite and gypsum-bearing residual oolitic dolomite.The south is a low energy lithofacies combination consisting of micrite and muddy limestone.The middle-late stage of Changxing Formation is a LST deposition under sedimentary background of the gentle slope and open platform with rims and the early stage of Feixianguan 1^st is TST on the basis of sedimentary paleogeomorphology of the Changxing Formation.Meanwhile the oolitic shoals which consist of gypsum-bearing residual oolitic dolomite concentrate in carbonate terrace such as Yuexi 1-Jinzhu 1-Gaozhang 1 well area.The late stage of Feixianguan 1^stto Feixianguan 2^nd is the key stage of oolitic shoal reservoir development which is HST deposition of the gentle slope and restricted platform with rims.Under the jointly control of NW-trending basement fracture and NE-trending geomorphic highland，thick oolitic shoals of “U” shape develop along the platform margin.The north of the platform margin is the evaporation lagoon environment and the south is upper glacis sedimentary environment along Tiancheng 1-Mennan 1-Xinxing 1,and the southward transition to the lower glacis sedimentary environment.

Key words: The gentle slope and restricted platform with rims, Lithofacies zoning, Sedimentary evolution, Oolitic shoal;Feixianguan Formation, Northeastern Sichuan Basin

CLC Number:

TE122.2

Jiang Yu-qiang, Gu Yi-fan, Xu Chang-hai, Zhang Jie-wei, Cheng Xiao-yan, Chen Hui. Feixianguan Formation lithofacies zoning and its geological significance of eastern side of Kaijiang-Liangping Trough，NE Sichuan Basin[J].Natural Gas Geoscience, 2018, 29(8): 1067-1077.

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Feixianguan Formation lithofacies zoning and its geological significance of eastern side of Kaijiang-Liangping Trough，NE Sichuan Basin

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